US5276416A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US5276416A
US5276416A US07/946,769 US94676992A US5276416A US 5276416 A US5276416 A US 5276416A US 94676992 A US94676992 A US 94676992A US 5276416 A US5276416 A US 5276416A
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US
United States
Prior art keywords
disposed
current transformer
movable contact
case
conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/946,769
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English (en)
Inventor
Masashi Ozaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP3240961A external-priority patent/JPH0582010A/ja
Priority claimed from JP3240960A external-priority patent/JP2809900B2/ja
Priority claimed from JP24922691A external-priority patent/JP2809904B2/ja
Application filed by Toshiba Corp filed Critical Toshiba Corp
Assigned to KABUSHIKI KAISHA TOSHIBA reassignment KABUSHIKI KAISHA TOSHIBA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OZAKI, MASASHI
Application granted granted Critical
Publication of US5276416A publication Critical patent/US5276416A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • H01H83/226—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with differential transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
    • H01H71/125—Automatic release mechanisms with or without manual release using a solid-state trip unit characterised by sensing elements, e.g. current transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/06—Arrangements for supplying operative power
    • H02H1/063—Arrangements for supplying operative power primary power being supplied by fault current

Definitions

  • This invention relates to an electrical circuit breaker of the type that main contacts provided across electric supply lines connected to a load are opened upon flow of an excessive current such as an overload current.
  • Conventional electrical circuit breakers of the above-described type comprise a current transformer for detecting an overcurrent, a control circuit generating an overcurrent trip signal based on a detection output of the current transformer, and a tripping device for opening the main contacts provided across the electric supply lines, via a switching mechanism.
  • the current transformer, the control circuit and the tripping device are disposed at respective positions away from the switching mechanism opening and closing the main contacts and nearer to terminals of the load side.
  • circuit breaker of the above-described type When the circuit breaker of the above-described type is employed for three-phase circuits, particularly, three current transformers with the electric supply lines to the load as respective primary conductors are provided since the detection of the overload current needs to be performed for the respective electric supply lines.
  • the three transformers thus occupy concentrated positions in proximity to the load side terminals.
  • a zero-phase-sequence current transformer when incorporated for addition of a function of an earth leakage breaker or when a control power transformer is incorporated, these are also disposed in proximity to the load side terminals. Consequently, the assembly of the circuit breaker is complicated and its compactness is prevented although that has been desired from the standpoint of secured distance for insulation.
  • an object of the present invention is to provide a circuit breaker wherein an unavoidable useless space in the case can be effectively used for disposition of the current transformers and accordingly, concentration of the parts can be avoided and improvement in the readiness of assembly and compactness can be achieved.
  • the present invention provides a circuit breaker comprising an insulative case enclosing a first electric conductor extending from one end of the case toward the other end thereof and a second electric conductor extending from said other end of the case toward said one end thereof.
  • a power-supply side terminal is provided on the first conductor at said one end side of the case.
  • a load side terminal is provided on the second conductor at said other end side of the case.
  • a movable contact arm carries a movable contact electrically connected to an end side of the second conductor opposite to the load side terminal and is disposed for rotative movement.
  • the movable contact composes main contacts together with a fixed contact connected to an end side of the first conductor opposite to the power-supply side terminal.
  • a switching mechanism is disposed between the main contacts and the load side terminal of the second conductor in the insulative case for rotatively moving the movable contact arm, thereby opening and closing the main contacts.
  • a current transformer is disposed between the power-supply side terminal and the main contacts in the insulative case.
  • the current transformer may be positioned so that the movable contact arm extends through it.
  • the current transformer is disposed in the space between the power-supply side terminal and the main contacts or disposed together with the movable contact arm.
  • This space in which the current transformer is disposed is conventionally useless. Consequently, the congestion of the parts can be relieved and the readiness of assembly of the circuit breakers can be improved. Furthermore, the circuit breaker can be rendered compact since the space which was conventionally useless can be effectively utilized.
  • the current transformer employed for securing the control power or for other purposes is disposed together with the first conductor so that the first conductor serves as a primary conductor of the current transformer.
  • the current transformer employed for detecting the overcurrent are disposed together with the movable contact arm respectively so that the movable contact arm serves as a primary conductor of the current transformer.
  • the zero-phase-sequence current transformer for breaking the earth leakage is disposed across the second conductor so that the second conductor serves as a primary conductor of the zero-phase-sequence current transformer.
  • the current transformer for the overcurrent detection is disposed in the insulative case so that the movable contact arm extends through the current transformer.
  • the current transformer for the overcurrent protection comprises a core with two ends and coils wound around the core and the core is formed so that an air gap defined between the ends of the core serves as a part of a magnetic path. Consequently, the working for extending the primary conductor through the core of the current transformer can be simplified.
  • FIG. 1 is a partially longitudinally sectional view of a circuit breaker of a first embodiment in accordance with the invention
  • FIG. 2 is a plan view of one of current transformers employed in the circuit breaker
  • FIG. 3 is a circuit diagram showing an electrical arrangement of the circuit breaker
  • FIG. 4 is a view similar to FIG. 1 showing the circuit breaker of a second embodiment
  • FIG. 5 is a plan view of one of current transformers employed in the circuit breaker
  • FIG. 6 is a view similar to FIG. 1 showing the circuit breaker of a third embodiment
  • FIG. 7 is a circuit diagram showing an electrical arrangement of the circuit breaker
  • FIG. 8 is a graph showing the current-detection characteristics of first and second current transformers employed in the circuit breaker of the third embodiment
  • FIG. 9 is a view similar to FIG. 1 showing the circuit breaker of a fourth embodiment.
  • FIG. 10 is a perspective view showing a part of an insulative case of the circuit breaker.
  • An insulative or molded case 1 comprises a base 1a and a cover 1b.
  • Three first electric conductors 2a one of which is shown are disposed on the base 1a so as to each extend from one end of the case 1 toward its other end.
  • Three second electric conductors 3a one of which is shown are disposed on the base so as to each extend from said other end toward said one end of the base 1a.
  • Each first conductor 1a has a power-supply side terminal 2 formed integrally with it at its one end corresponding to said one end of the base 1a.
  • Each fixed contacts 7 composing three main contacts 9 respectively are secured on the other ends of the respective first conductors 2a. Only one of the fixed contacts 7 is shown.
  • Each second conductor 3a has a load side terminal 3 formed integrally with it at its one end corresponding to said other end of the base 1a.
  • Each movable contact arm 4 is rotatably mounted on a cross bar 5 through a connection pin 6.
  • Three movable contacts 8 are secured to the distal ends of the movable contact arms 4 so as to be engaged with and disengaged from the fixed contacts 7 respectively.
  • the opposite ends of the movable contact arms 4 are electrically connected to the other ends of the second conductors 3a through flexible conductors 4a respectively.
  • a switching mechanism 10 is provided in a space over the connection pins 6 about which the respective movable contact arms 4 are rotatively moved.
  • the switching mechanism 10 has the same construction as employed in the conventional circuit breakers. Rotative movement of an operating handle 10a is converted to rotative movement of the movable contact arms 4 and the switching mechanism 4 operates to rotatively move the movable contact arms 4 in response to a tripping device 18 so that the main contacts 9 are opened.
  • the opening and closing of the main contacts 9 electrically disconnect and connect the first and second conductors 2a, 3a providing power feed paths to a load.
  • each current transformer 11 for detecting a load current to determine an overcurrent is disposed in spaces between the main contacts 9 and the power-supply side terminals respectively. Only one of the current transformers 11 is shown.
  • the current transformers 11 are designed to detect a load current flowing through a power feed path of each phase. More specifically, each current transformer 11 comprises a core 12 configured into a closed loop and a secondary winding 13 wound on a bobbin 14 provided around the core 12, as is shown in FIG. 2.
  • Each current transformer 11 is disposed in the insulative case 1 such that the first conductor 2a having the power-supply side terminal 2 extends through a window 15 of the core 12.
  • each current transformer 11 produces a detection voltage whose level is in accordance with the magnitude of a load current flowing through the conductor 2a as the primary conductor.
  • a zero-phase sequence current transformer 16 is disposed in a space between the movable contact arms 4 and the load side terminals 3 in the insulative case 1.
  • the zero-phase-sequence transformer 16 is designed to detect an earth fault current flowing through the power feed path to the load.
  • the zero-phase-sequence current transformer 16 comprises a closed-loop core similar to that of each current transformer 11 and is arranged so that the second conductors 3a having the respective load side-terminals 3 for the three phases collectively serve as a primary conductor. Consequently, the zero-phase-sequence current transformer 16 produces a detection voltage whose level is in accordance with the magnitude of an earth fault current flowing through the conductors 3a serving as the primary conductor.
  • a control circuit 17 arranged as will be described later and a tripping device 18 are disposed in a space over the zero-phase-sequence transformer 16.
  • the tripping device 18 is provided for rotatively moving the movable contact arms 4 in the circuit-opening direction.
  • the electrical arrangement of the circuit breaker will be described with reference to FIG. 3.
  • the electric circuitry shown in FIG. 3 is arranged in the same manner as in the conventional three-phase circuit breakers.
  • the tripping device 18 comprises a trip coil 18a which is energized to rotatively move the movable contact arms 4 in the contact-opening direction via the switching mechanism 10 so that the main contacts 9 are opened.
  • a rectifier circuit 19 of the control circuit 17 rectifies detection voltages detected by the current transformers 11 of the respective phases. Its rectified output is supplied to a power-supply circuit 21 through a resistance 20 composing a current-to-voltage conversion circuit. The resistance 20 generates across its ends a voltage signal V f whose level is in accordance with the magnitude of the load current.
  • An auxiliary power-supply circuit 22 is provided for rectifying an interphase voltage at the load side terminals 3.
  • An overcurrent trip circuit 23 fed with power from the power-supply circuit 21 generates an overcurrent trip signal S a when the level of the load current indicated by the voltage signal V f from the resistance 20 remains above a predetermined time delay operating level for more than a predetermined operating period.
  • a thyrister 24 is turned on, so that the trip coil 18a is energized by the rectifier circuit 19 and the auxiliary power-supply circuit 22 through respective diodes 19a and 22a.
  • An earth-leakage trip circuit 25 is energized by the auxiliary power-supply circuit 22.
  • the earth-leakage trip circuit 25 generates an earth-leakage trip signal S b when the level of an earth fault current indicated by a detection voltage generated from the secondary side of the zero-phase-sequence current transformer 16 exceeds a predetermined sensitivity current level.
  • the thyrister 26 is turned on, so that the trip coil 18a is energized either by the rectifier circuit 19 through the diode 19a or by the auxiliary power-supply circuit 22 through the diode 22a.
  • electric power feed paths are formed by the respective conductors 2a and 3a. If a fault current such as an overload current or a short-circuit current should flow through at least one of the above-mentioned power feed paths, the fault current is detected by the corresponding current transformer 11.
  • the overcurrent trip signal S a is generated by the overcurrent trip circuit 23 when the level of current detected by the current transformer 11 remains above the predetermined time delay operating level for more than the predetermined operating period.
  • the thyrister 24 is turned on in response to the overcurrent trip signal S a such that the trip coil 18a is energized to open the main contacts 9. Thus, an overcurrent tripping operation is performed.
  • the earth fault current flows through at least one of the power feed paths to the loads.
  • the earth-leakage trip signal S b is generated by the earth-leakage trip circuit 25 when the level of the detected earth fault current exceeds the predetermined sensitivity current level.
  • the thyrister 26 is turned on in response to the generated earth-leakage trip signal S b such that the trip coil 18a is energized to open the main contacts 9. Thus, an earth leakage tripping operation is performed.
  • the zero-phase-sequence current transformer 16 requiring a relatively large mounting space is disposed at one side together with the second conductors 3a in the case 1 while the three current transformers 11 are disposed in the space between the main contacts 9 and the power-supply side terminals 2 in the case 1.
  • the space between the main contacts 9 and the power-supply side terminals 2 has conventionally been an empty space.
  • this space is utilized for mounting the current transformers 11 in the above-described embodiment.
  • the space for mounting the second conductors 3a need not be increased.
  • the circuit breaker can be rendered small-sized.
  • FIGS. 4 and 5 illustrate a second embodiment of the invention. Difference between the first and second embodiments will be described.
  • the second embodiment is characterized by provision of three current transformers 27 for which the movable contact arms 4 serve as the first conductors respectively, as is shown in FIG. 4.
  • Each current transformer 27 comprises a generally U-shaped core 29 having two ends and a secondary winding 29 wound about a bobbin 30 provided around the core 28, as is shown in FIG. 5.
  • An air gap between the both ends of each core 28 is used as a part of the magnetic path.
  • Each transformer 27 is disposed so that the movable contact arm 4 extends through the space between opposed yoke portions 28a.
  • each current transformer 27 has the U-shaped core 28 having the air gap 28b between the yoke portions 28a, the working for inserting the primary conductor through the air gap 28b can be simplified as compared with that in the closed-loop core.
  • FIGS. 6 through 8 illustrate a third embodiment of the invention. Same parts as in the first embodiment are labeled by the identical reference numerals.
  • three first current transformers 31 one of which is shown are formed into the same arrangement as that shown in FIGS. 1 and 2 and are disposed in the case 1 so that the first conductors 2a serve as the primary conductors for the respective current transformers 31.
  • These first current transformers 31 are for the control power supply.
  • Three second current transformers 32 one of which is shown are formed into the same arrangement as that shown in FIG. 5 and are disposed in the case 1 so that the movable contact arms 4 serves as the primary conductors for the second current transformers 32 respectively.
  • a control circuit 33 a power-supply circuit 34 corresponding to the circuit 21 is provided independently. The output of each current transformer 31 is supplied to the input side of the power-supply circuit 34 through a rectifier circuit 35.
  • FIG. 8 shows the characteristics of the detection voltage detected by each first current transformer 31 and the detection voltage detected by the second current transformer 32. Since the core 28 of each second current transformer 31 has the air gap 28b, the load current at the time of saturation of each current transformer 31 takes a relatively large value even though the volume of the core 28 is small. Accordingly, the linearity of the detection voltage can be maintained over a vast range even when each second current transformer 32 is rendered small-sized. Furthermore, the output of each gapless first current transformer 31 is saturated with a relatively small load current but is only used as the power supply for the overcurrent trip circuit. As a result, the core 12 of each first current transformer 31 can be rendered small-sized without any problems about its function. That is, both of the first and second current transformers 31, 32 can be rendered small-sized, which can contribute to the miniaturization of the circuit breaker.
  • FIGS. 9 and 10 illustrate a fourth embodiment.
  • the base 1a has three hollow portions 36 formed integrally with it and three pairs of hollow protrusions 37a and 37b also formed integrally with it.
  • Three containing sections 38 are defined by the respective hollow portions 36 and the respective pairs of the hollow protrusions 37a, 37b. More specifically, each hollow portion 36 is formed on the portion of the base 1a corresponding to each movable contact arm 4 so as to be expanded to the side of the cover 1b.
  • Each hollow portion 36 has a rear open end.
  • the three pairs of hollow protrusions 37a, 37b communicate to and are projected from the respective hollow portions 36.
  • Each pair of the hollow protrusions 37a, 37b are opposed to the adjacent pair with an area of rotative movement of each movable contact arm 4 interposed therebetween.
  • the foregoing second current transformers 32 are contained in the respective containing sections 38. In this state, the secondary windings 29 of the current transformers 32 are disposed in the respective hollow portions 36 and both yoke portions 28a of the cores 28 are disposed in the respective hollow protrusions 37a.
  • the current transformers 32 are only inserted into the containing sections 38 through the rear open ends respectively. Consequently, the efficiency in the assembly of the circuit breakers can be improved. Furthermore, the walls defining the containing sections 38 are placed between the current transformers 32 and the conductors 2a, 3a, 4 composing the power feed paths to the loads, respectively. Consequently, the current transformers 32 can be insulated from those conductors with a simplified insulation structure.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
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US07/946,769 1991-09-20 1992-09-17 Circuit breaker Expired - Fee Related US5276416A (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP3240961A JPH0582010A (ja) 1991-09-20 1991-09-20 漏電遮断器
JP3240960A JP2809900B2 (ja) 1991-09-20 1991-09-20 回路遮断器
JP3-240961 1991-09-20
JP3-240960 1991-09-20
JP3-249226 1991-09-27
JP24922691A JP2809904B2 (ja) 1991-09-27 1991-09-27 漏電遮断器

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US5276416A true US5276416A (en) 1994-01-04

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US07/946,769 Expired - Fee Related US5276416A (en) 1991-09-20 1992-09-17 Circuit breaker

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US (1) US5276416A (ko)
KR (1) KR970007776B1 (ko)
FR (1) FR2681725A1 (ko)

Cited By (28)

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GB2295276A (en) * 1994-11-15 1996-05-22 Matsushita Electric Works Ltd Leakage-responsive circuit breaker
GB2303980A (en) * 1995-08-02 1997-03-05 Sheir Chun Lam Circuit breaker
US5835323A (en) * 1996-03-19 1998-11-10 Hosiden Corporation Electrical connector with breaking current for leak
US5886606A (en) * 1995-11-14 1999-03-23 Fuji Electric Co., Ltd. Circuit breaker
US5943204A (en) * 1998-01-12 1999-08-24 Eaton Coroporation Electronic trip unit with dedicated override current sensor
US6008973A (en) * 1998-05-27 1999-12-28 Square D Company Circuit breaker including interface to convert a rectified signal to a sinusoidal signal
WO2001093290A1 (en) * 2000-05-30 2001-12-06 Human El-Tech,Inc Circuit breaker with electro-magnetic trip apparatus
CN1078009C (zh) * 1995-09-19 2002-01-16 株式会社日立制作所 接地漏电断路器
US6377431B1 (en) 1999-08-13 2002-04-23 Eaton Corporation Non-automatic power circuit breaker including trip mechanism which is disabled after closure of separable contacts
US20030099073A1 (en) * 2000-08-22 2003-05-29 Takashi Anamura Ground fault interrupter
US20050207075A1 (en) * 2002-08-02 2005-09-22 Protectelec Pty Limited Control circuit and a method for electrically connecting a load to a power source
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US20080012670A1 (en) * 2006-07-14 2008-01-17 Square D Company Switch-to-trip point translation
US20080012666A1 (en) * 2006-07-14 2008-01-17 Square D Company Method and system of current transformer output magnitude compensation in a circuit breaker system
US20080013235A1 (en) * 2006-07-14 2008-01-17 Square D Company Redundant instantaneous trip detection
US20080013238A1 (en) * 2006-07-14 2008-01-17 Square D Company Low cost user adjustment, resistance to straying between positions, increased resistance to ESD, and consistent feel
US20080012677A1 (en) * 2006-07-14 2008-01-17 Squara D Company Circuit breaker-like apparatus with combination current transformer
US20080012668A1 (en) * 2006-07-14 2008-01-17 Square D Company Redundant trip activation
US20080012667A1 (en) * 2006-07-14 2008-01-17 Square D Company Method and system for time synchronized trip algorithms for breaker self protection
US20080012669A1 (en) * 2006-07-14 2008-01-17 Square D Company Burden resistor temperature compensation algorithm
US20080048624A1 (en) * 2006-07-14 2008-02-28 Square D Company Method and system of fault powered supply voltage regulation
US20080081511A1 (en) * 2006-06-30 2008-04-03 Molex Incorporated Low profile latching connector and pull tab for unlatching same
US7788055B2 (en) 2006-07-14 2010-08-31 Square D Company Method and system of calibrating sensing components in a circuit breaker system
ITBG20110010A1 (it) * 2011-04-06 2012-10-07 Abb Spa Dispositivo di commutazione elettrica.
EP2727126A1 (de) * 2011-11-02 2014-05-07 Siemens Aktiengesellschaft Auslösereinheit zum auslösen eines auslöseelementes eines elektrischen schaltgerätes sowie elektrisches schaltgerät
CN109326491A (zh) * 2018-11-21 2019-02-12 首瑞（天津）电气设备有限公司 断路器
EP3940908A1 (en) * 2020-07-16 2022-01-19 Schneider Electric Industries SAS Power supply device for motor protector and power supplying method thereof
US11799319B2 (en) 2020-03-18 2023-10-24 Smart Wires Inc. Power supply system responsive to high and low line currents

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ATE227883T1 (de) * 1997-09-19 2002-11-15 Circuit Breaker Ind Schutzschalter
CN105097369B (zh) * 2014-05-07 2018-12-28 布蒂克诺公司 塑壳断路器及其组装方法
CN105097376B (zh) * 2014-05-07 2019-01-11 布蒂克诺公司 具有灭弧屏障的断路器

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Cited By (47)

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Publication number Priority date Publication date Assignee Title
GB2295276B (en) * 1994-11-15 1998-10-14 Matsushita Electric Works Ltd Leakage-responsive circuit breaker
GB2295276A (en) * 1994-11-15 1996-05-22 Matsushita Electric Works Ltd Leakage-responsive circuit breaker
CN1047021C (zh) * 1994-11-15 1999-12-01 松下电工株式会社 漏电敏感断路器
CN1127745C (zh) * 1995-08-02 2003-11-12 林社振 断路器
GB2303980A (en) * 1995-08-02 1997-03-05 Sheir Chun Lam Circuit breaker
GB2303980B (en) * 1995-08-02 1997-09-10 Sheir Chun Lam Circuit breaker
CN1078009C (zh) * 1995-09-19 2002-01-16 株式会社日立制作所 接地漏电断路器
US5886606A (en) * 1995-11-14 1999-03-23 Fuji Electric Co., Ltd. Circuit breaker
AU725859B2 (en) * 1996-03-19 2000-10-26 Hosiden Corporation Electrical connector with breaking current for leak
US5835323A (en) * 1996-03-19 1998-11-10 Hosiden Corporation Electrical connector with breaking current for leak
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KR930006779A (ko) 1993-04-21
FR2681725A1 (fr) 1993-03-26
KR970007776B1 (ko) 1997-05-16
FR2681725B1 (ko) 1994-12-30

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